PATENTED
A.C. Characteristics
Symbol
f
SYS1
f
SYS2
f
SYS3
f
LCD1
f
LCD2
f
LCD3
t
COM
f
CLK1
Parameter
System Clock
System Clock
System Clock
LCD Frame Frequency
LCD Frame Frequency
LCD Frame Frequency
LCD Common Period
4-Bit Data Clock (WR Pin)
5V
3V
f
CLK2
4-Bit Data Clock (RD Pin)
5V
t
CS
4-Bit Interface Reset Pulse
Width (Figure 3)
¾
3V
t
CLK
WR, RD Input Pulse Width
(Figure 1)
5V
Read mode
t
r
, t
f
t
su
t
h
t
su1
t
h1
f
tone2k
f
tone4k
Rise/Fall Time Serial Data
Clock Width (Figure 1)
Setup Time for DATA to WR,
RD Clock Width (Figure 2)
Hold Time for DATA to WR,
RD Clock Width (Figure 2)
Setup Time for CS to WR,
RD Clock Width (Figure 3)
Hold Time for CS to WR,
RD Clock Width (Figure 3)
Tone Frequency
Tone Frequency
¾
¾
¾
¾
¾
5V
5V
¾
¾
¾
¾
¾
On-chip RC oscillator
On-chip RC oscillato
3.34
¾
80
60
50
50
1.5
3.0
Read mode
Write mode
6.67
1.67
CS
Write mode
Duty cycle 50%
Test Conditions
V
DD
5V
¾
¾
5V
¾
¾
¾
3V
Duty cycle 50%
Conditions
On-chip RC oscillator
Crystal oscillator
External clock source
On-chip RC oscillator
Crystal oscillator
External clock source
n: Number of COM
Min.
24
¾
¾
61/117
¾
¾
¾
¾
¾
¾
¾
150
3.34
Typ.
32
32768
32768
89/170
64
64
n/f
LCD
¾
¾
¾
¾
250
¾
Max.
40
¾
¾
111/213
¾
¾
¾
150
300
75
150
¾
¾
HT1670
Ta=25°C
Unit
kHz
Hz
Hz
Hz
Hz
Hz
sec
kHz
kHz
kHz
kHz
ns
ms
¾
120
120
120
100
100
2.0
4.0
¾
160
¾
¾
¾
¾
2.5
5.0
ms
ns
ns
ns
ns
ns
kHz
kHz
Rev. 1.60
7
November 9, 2010
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
